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You'd better chrony it with/without suppressor...and, because of the nature of gas pistols/rifles, you'll want to account that for heavier ammo you need to be shooting lower velocities so you end up shooting the same power level (in Joules) as a gun shooting with 0.20's at whatever velocity limit there is. With gas guns you'll sometimes find a gun that shoots 400fps w/0.20's...and it shoots at/nearly-at 400fps when you use heavier BB's.
Chrony with greengas/propane...and with duster if that's what you're going to use.
With 0.30's we had some setups shooting 450fps...which is WAY too hot for most uses.
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